AE92 Fuel Rail / 3SGE Injectors. Fuel Rail leaking @ No 4 Injector

[GeeEss]

Running Quads on a Bigport; trying to do pre-tune WARI set up but can't get to first base due to fueling issues. . .

Fuel is leaking (or more accurately; dribbling/pouring) past the O-ring seal on# 4 injector.

I have changed all the rubbers on the injectors; pads/ O-rings & spacers but fuel is still pissing past the seal on #4 and I'm at a loss as to why.


O-rings:

1. The 3SGE injectors came with O-rings; these were units in car when I first diagnosed the problem.
2. I had 4 new AE92 injector O-rings so put these on the 3SGE injectors to see if they'd make a difference; they didn't
3. I then went out & got 4 new 3SGE O-rings < different part numbers to AE92 units but they look identical to naked eye>. That didn't fix the problem either.

Can anyone confirm if AE92/3SGE injector O-rings have identical cross-section (or otherwise)?


Fuel Rail:

I have never had a problem with the rail before (with OEM injection) and haven't touched the Fuel rail so can't see why it would be that.


Spacers:

The 3SGE injectors have a higher shoulder than those on the AE92 so when you put AE92 spacer pads on them they concertina flat < photo shows old loose & sloppy spacers - changed them 4 new ones but it didn't stop the leak*>. Also tried mounting injectors w/out the spacers - no difference, still leaking at #4. . .

* As they are just pads not seals this was no surprise.


Blockage?

When I first activated the Pump; fuel was pissing past the Union on the Fuel Filter, so I tightened the bolt; then the leak moved to the 22mm bolt/pulsation Dampener union, so I tightened that up. Now its at the Injector itself so maybe there's a pressure build up somewhere?

Help. . . .